Autonomous Nanosensor System for Monitoring and Quantifying Arsenic in Water

S. Salinas, N. Mosquera, L. Yate, E. Coy, G. Yamhure, E. González
Pontificia Universidad Javeriana, CO

Keywords: nanosensor, plasmon resonance, arsenic

Summary:

In present work, we have developed a system for detection and quantification of arsenic in water, based on surface plasmon resonance. The sensor uses a gold self-assembled monolayers on Au(111) substrate. Studies that we have done with self-assembled monolayers on gold substrate type Au(111) allowed us to evaluate the behavior and evolution of the substrate as it is reuse, which led us to perform a protocol for functionalization in aqueous medium to ensure autonomous and repetitive use of the substrate which makes it possible sensing concentrations close to 5 parts per billion. We have developed a novel self-functionalization system of monolayers on Au(111) for recognition and fixation of arsenic, that makes possible to use In situ of the substrate repeatedly (over 100 times). Furthermore, the system can perform water sources monitoring in real-time for detection and measurement of arsenic concentration in water. The system is equipped with a wireless communications module that allows the configuration of a network of sensors dedicated to mapping and monitoring arsenic concentrations produced by anthropogenic and natural causes in drinking water.